Pendant-stem for watches



(No Model.)

' H, ROHRDANTZ. PENDANT STEM-FOR WATCHES;

Patented Apr. 19, 1887.

WITNESSES UNITED STATES PATE T OFFICE.

HENRY ROHRDANTZ, OF RIVERHEAD, NEIV YORK.

PENDANT-STEM FO R WATCH ES.

SPECIFICATION formingyart of Letters Patent No. 361,597, dated April 19, 1887.

. Application filed January 15, 1887.

To all whom it may concern:

Be it known that 1, HENRY ROHRDANTZ, a citizen of the-United States, and a resident of Riverhead, in the county of Suffolk andState of New York, haveinvented certain new and use ful Improvements in Steminding WVatches; and I dodeclare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification. Figure 1 of the drawings is a representa tion of a vertical longitudinal section through a watch-pendant. Fig. 2 is a plan view of the same. Fig. 3 is a vertical longitudinal section showing a modification.

My invention relates to stem winding watches; and it consists in the construction and novel combination of parts, as hereinafter described and claimed.

The object of the invention is to protect the mainspring and ratchet-wheels when winding the watch. 7

Referring by letter to the accompanying drawings, 6 designates the pendant on the watch-case.

a is the stem, which is provided with the reduced portions g b c, which decrease in diameter in. the order named. The portion g has a plain periphery, the portion b is provided with a left-hand thread, and the por tion 0 is provided with a right-hand thread.

(I designates the'head of the winding device, said head being provided with a seat in its lower side,which seat fits over the stem a and also over the pendant e on the case.

- h is a steel washer or annular plate,whieh is interposed between the shoulder s of the stem a and the lower face of the head.

In its upper portion the headd is provided with a seat, It, into which the portions 2) c of the stem a project. A washer or steel plate, i, is first put in place in the seat It. The collar f, which is threaded internally,is then screwed provided with holes 00 x, for the reception of the points of the toolby which said collars are Serial No. 224,473. (No model.)

turned to place. pendant by a screw, 10, the point of which enters a groove, y, in the stem.

In this construction it will be observed that the right-hand collar is put upon the left-hand collar. The left-hand collar should be put on tight enough to permit the head to be just movable to the left. The right-hand collar should then be put in place. The left-hand collar will loosen a little by continuing to turn the head after winding but not enough to turn the head too loose, for the reason that the right- .hand screw-threads will prevent it. I

The device can be so regulated that by winding, the head will not move around the stem; but when the winding stops and the person keeps on turning, the head will turn without affecting the mai'nspring and ratchet-wheels. When once properly regulated,it will not get out of order, as it will either loosen or tighten by winding, as may benecessary.

The precise arrangement above described is not essentially necessary to produce the desired result, as the right and left hand collars may be put on the stem in the lower part of the head without departing from the character of the invention, it being a change in location only.

Having described this invention, what I claim,and desire to secure by Letters Patent, 1s

1. The combination, with the pendant and gearing ot a watch, of the shouldered stern having the right-hand'and left-hand threads, the washer h,the head (I, washer t, and the collarsf and 9, provided withleft-hand and right- HENRY ROH RD ANTZ.

Witnesses:

R. T. SKIDMORE, R. G. BENJAMIN.

The stem is secured in the. 

